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. 1997 Jul;71(7):5528–5539. doi: 10.1128/jvi.71.7.5528-5539.1997

Recognition of prominent viral epitopes induced by immunization with human immunodeficiency virus type 1 regulatory genes.

J Hinkula 1, C Svanholm 1, S Schwartz 1, P Lundholm 1, M Brytting 1, G Engström 1, R Benthin 1, H Glaser 1, G Sutter 1, B Kohleisen 1, V Erfle 1, K Okuda 1, H Wigzell 1, B Wahren 1
PMCID: PMC191795  PMID: 9188627

Abstract

Mice immunized with the regulatory genes nef, rev, and tat from human immunodeficiency virus type 1 developed both humoral and cellular immune responses to the gene products Nef, Rev, and Tat. This study demonstrates that it is feasible to induce immune reactions to all of these regulatory gene products. Humoral responses were seen after DNA boosts, while potent T-cell proliferative responses were noted already after a single immunization. A Th1-directed immune response was demonstrated early after immunization. A 3- to 75-fold-stronger T-cell response was seen in animals receiving DNA epidermally compared to that in animals receiving intramuscular injections. Nef, Rev, and Tat putative B- and T-cell epitopes were clearly mapped by using peptides derived from the regulatory proteins and were similar to those which are detected in human immunodeficiency virus infection. Although immunization by the Nef, Rev, and Tat proteins raised high immunoglobulin G titers in serum, the epitope spreading appeared broader after DNA immunization. The combination of all of these regulatory genes together with two genes for structural proteins, the envelope and gag genes, demonstrated that a combined approach is feasible in that reactivities to all antigens persisted or were even augmented. No interference between plasmids was noted.

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Selected References

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